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Filing comprehensive income tax as a freelancer: what to prepare

No employer settles a freelancer's tax, so you report the year's income yourself. Here is the structure, the records to gather and common mistakes.

📚 Personal Finance Basics · 12/16· ⏱ About 4min read ·Information updated 2026-10-01

📋 Key facts

Key
Filing settles the gap between tax withheld from your fees and the tax you actually owe
Expenses
Tax differs depending on whether you keep books or use government-set expense ratios
Gathering records
Start by checking payment statements and your filing type on the tax service website
Figures
Check withholding rates, expense ratios and deadlines in National Tax Service guidance
Caution
This is general preparation guidance, not tax advice

Why freelancers must file themselves

Employees have their tax squared up by the employer through year-end settlement. Freelancers on service contracts have a portion withheld when paid, but that is only a provisional amount. The actual tax, reflecting the year's business income, expenses and deductions, is settled through the comprehensive income tax return the following year. If too much was withheld you get a refund; if too little, you pay more. Not filing can mean missing a refund or paying penalties.

How the tax is determined

The overall shape is similar to an employee's, except that necessary expenses are subtracted instead of the earned income deduction. How your expenses are recognized therefore shapes the result.

  • Total the gross revenue received during the year
  • Subtract necessary expenses to get business income
  • Subtract personal and other income deductions to get the tax base
  • Apply tax rates and subtract tax credits
  • Compare with tax already withheld for a refund or payment

Bookkeeping versus expense ratios

There are two main ways to calculate expenses. One is to record actual costs in books and support them with evidence. The other, used without books, applies a government-set expense ratio for your industry to revenue. Which is allowed and which is better depends on income size and industry. Using a ratio when your real expenses are high can cost you, and filing without books when you are required to keep them can bring disadvantages. Check your type in the online filing guidance first.

Examples of deductible expenses

To count as an expense, a cost must relate directly to your work and be documented. The scope differs by industry, so treat these only as common examples. Spending mixed with personal life needs the work portion to be separable.

  • Equipment and software used for work
  • Work phone and internet, and rent for a workspace
  • Work-related training and books
  • Business travel and transportation
  • Fees paid to subcontractors, with payment records

Building a habit of keeping evidence

Hunting for receipts all at once at filing time means missing many. Keeping separate accounts and cards for work and personal use makes expenses far easier to sort. Registering a business card with the tax service website makes its transactions easy to look up. Get cash receipts or invoices for cash payments, and keep contracts alongside deposit records for fees received. Just tidying up once a month greatly lightens the filing load.

Records to check before filing

Before you start, download the data the tax service already holds about you. The starting point is confirming that payment statements submitted by clients match what you actually received. If you worked for several clients, make sure none are missing.

  • Payment statements (business income withholding records)
  • The filing type shown in your income tax notice
  • Whether you also have wages or other income
  • Medical, pension savings, donation and other deduction records

Common mistakes

The most common is skipping the return because withholding seems to have covered everything; without expenses reflected, a possible refund is easily missed. People with a salaried job and freelance side work must combine wage and business income, yet some assume year-end settlement finished it. Putting personal spending in as expenses can cause trouble later. On the other hand, many miss legitimate work costs simply for lack of receipts. Filing without checking that payment statements match actual deposits, or leaving out one of several clients, is also frequent. If you later find an error, an amended return or correction request within the allowed period can fix it, so do not leave it.

Preparing through the year

Filing happens once, but preparation runs all year. Freelancers with uneven income may owe extra, so setting aside part of every payment in a separate tax account prevents a scramble at filing time. Health insurance premiums and other charges can also depend on income, so factor them in. Confirm deadlines and rates in each year's official guidance, and if income is large or complicated, consult a tax professional. This article is general preparation guidance, not tax advice.

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